JPH0764669B2 - Explosive line - Google Patents

Description

TECHNICAL FIELD The present invention relates to an explosive wire used for blasting.

[Prior Art] Conventionally, explosive wire is composed of core drug and coating material, and the wire diameter is 5 to 6 mm.
With a small diameter of φ, dry pen slits, hexogen or pentolite (mixture of pen slit and trinitrotoluene) etc. are used for heart medicine, and polyethylene sheet, paper tape, hemp thread, cotton etc. are used as coating materials. Used, these coating materials are wound in double or triple layers to wrap the core drug into a linear shape, and the outermost coating is made of vinyl chloride to have water resistance.

When it is actually used, it is used for blasting rocks or crushed objects alone or in combination with other explosives and cut to the required length. The problem with the conventional technique is that it causes a slight amount of spillage of the heart drug from the cut edge when cutting with a cutter or the like, which is not preferable for safety. This phenomenon tends to increase as the wire diameter increases.

[Problems to be Solved by the Invention] It is an object of the present invention to solve the above problems and provide an explosive wire that does not cause spillage of the heart drug during cutting without deteriorating the original explosive performance.

[Means for Solving the Problems] In order to solve the above problems, the explosive wire of the present invention has a diameter of 10 to
Consists of a 15 mm core drug and a coating layer.This core drug consists of an aqueous solution of a surfactant, a polyhydric alcohol solution of a surfactant, a hydrocarbon mineral oil, a plasticizer that is liquid at room temperature, dinitrotoluene, and polyethylene glycol. One or more of
And, it is moistened with 1 to 15% of a humectant with respect to the heart drug.

The explosive wire of the present invention follows the prior art regarding the core drug and the coating material, but the explosive wire having a slightly larger diameter (10 to 10
15mmφ) Suitable.

Hydrocarbon-based mineral oils, plasticizers, surfactants, etc. are applied as the wetting agent in the present invention, but these are around room temperature (about 40 ° C. or less) in order to facilitate mixing with the heart drug during production. It is preferable that it is liquid.

Among the above wetting agents, as the hydrocarbon mineral oil, light oil, kerosene, heavy oil, spindle oil, engine oil, turbine oil, cylinder oil, machine oil, gear oil, cutting oil, refrigeration oil, dynamo oil, liquid paraffin, etc. However, it is preferable that they are relatively difficult to volatilize and have low viscosity near room temperature and stable in quality, and liquid paraffin and spindle oil are particularly effective.

Most of the plasticizers are phosphoric acid ester-based, polyester-based, hydrophthalic anhydride-based, stearic acid-based, and trimetic acid-based plasticizers, and most of them are liquid at near room temperature and have lipophilicity. By itself, it gives the explosive wire of the present invention sufficient wettability to the heart drug, and is effective in preventing spillage of the heart drug.

Especially, the wetting effect of a plasticizer having a relatively low viscosity (2000 cps or less) at 25 ° C is great, and among them, dibutyl sebacate, dimethyl phthalate, diethyl phthalate, acetyltriethyl citrate, trichloroethyl phosphate, triacetin. Etc. are particularly preferable because they have a large wetting effect.

In addition, liquid dinitrotoluene is also effective at around room temperature, and polyethylene glycol etc. with an average molecular weight of 600 or less shows a wetting effect by itself, but it seems that the wettability to heart medicine is slightly weak, It is preferable to use the diluted mixed solution of (1) together with a surfactant because the effect is further improved.

In addition, the surfactant alone has slow wettability to the heart drug,
5% or less of surfactant in a diluted mixed system with water, glycerin, ethylene glycol or polyethylene glycol.
In the case of blending more than 05%, the wettability of heart medicine and the anti-spill effect are further improved.

Although some of the anionic and cationic surfactants are effective as the applied surfactant, nonionic surfactants having chemically stable properties are preferable, and polyethylene glycol type and polyhydric alcohols are preferable. Type surfactants are used, and as the polyethylene glycol type surfactants, higher alcohols, ethynylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts, fats and oils are used. Ethylene oxide adducts, polypropylene glycol ethylene oxide adducts and the like are applied, and as polyhydric alcohol type surfactants, fatty acid esters of glycerol, fatty acid esters of pentaerythritol, fatty acid esters of sorbitol and sorbitan, Fatty acid esters of ® sugar, alkyl ethers of polyhydric alcohols are used alone or in combination. A hydrophilic wetting agent having an HLB of 8 to 15 positions and an ethylene oxide adduct having an addition mole number of 7 to 12 have a particularly large wetting action.

Regarding the effective addition amount of the surfactant used in the present invention, it is effective if it is 0.05% or more with respect to the wetting liquid, but in view of economy, the range of 0.05 to 1.0% is suitable.

Further, the addition amount of the wetting agent according to the present invention is within the range of 1% or more and 15% or less with respect to the heart drug, and it is possible to obtain the anti-spill effect of the sufficiently moistened drug without losing the original performance of the explosive wire. . Although liquid separation is not seen up to 20% of the addition amount, even if a detonator is laid along the explosive wire coating to detonate, the sensitivity of the heart drug itself decreases, and the explosive wire does not explode. Further, if the added amount is 25% or more, there is a problem that liquid separation occurs with the cardiac drug, which is not preferable.

The prior art relating to the method of manufacturing the explosive wire is to supply and fill powdery dry pen slits, etc. into a paper cylinder formed into a cylindrical linear shape by using an auto feeder, and double the outer side with hemp thread etc. The outermost wrapping is done with vinyl chloride resin to complete the product.

The manufacturing method of the explosive wire according to the present invention is basically the same as the conventional method, but when a fixed amount of dry heart drug is supplied by an auto feeder, at the same time, a wetting agent is supplied at a constant amount from a supply pipe of another route. The following steps are manufactured according to the above conventional manufacturing method. At this time, the wetting agent may be heated or kept warm as necessary for adjusting the outflow amount.

The reason why the wetting agent of the heart drug for explosive wire according to the present invention needs to be liquid at around room temperature is that after the wetting agent is added and produced in the explosive wire manufacturing process, the wetting agent remains in the state of natural storage (storage). In the wetting agent of the present invention, the one having a liquid state at around room temperature (about 40 ° C. or less) particularly has this function. .

Regarding the natural permeability of the wetting agent according to the present invention, there is no practical inconvenience if the permeation rate is (0.2 mm / hour) or more and the permeation length is 5 to 6 mm or more, but the permeation rate is preferably (0.3 mm / hour).
It is preferable that the permeation length is 7 to 8 mm or more for more than 24 hours, and if possible, it is preferable that the permeation and dispersion of the explosive wire over the entire cross section of the heart drug within 24 hours after addition of the wetting agent are preferable.

The physical properties of the humectant relating to the present invention are such that even if the product is stored for a long period of time, the humectant added during the period and the heart drug act to cause deterioration or decomposition of the heart drug. I won't.

In addition, even if it has a liquid wettability at around room temperature, it is highly volatile, for example, general solvents such as gasoline, methanol, acetone, toluene, benzene, and adhesives and water using these as solvents. If there is a concern that some or all of the wetting agent will disappear during long-term storage and solidify the heart drug after long-term storage, such as compatible gels and sizing agents against friction and shock when cutting explosive wire However, it is not preferable as a humectant according to the present invention because it becomes dangerous.

[Operation] Although the reason why the heart drug does not spill even if the explosive wire according to the present invention is cut with a cutter or the like is not clearly understood, it is thought that it may be due to the adhesive action of the moistening agent on the wetting of the heart drug. To be Therefore, it is considered that a wetting agent having adhesiveness tends to have a larger anti-spill effect.

Next, the present invention will be specifically described with reference to examples.

[Examples] The effect of the wetting agent on the explosive wire precaution drug according to the present invention was evaluated by the following test methods.

Test 1 Put a heart drug (dry pen slit) in a test tube with a diameter of 15 mm.
The height was adjusted to 50 mm, 0.5 ml of various wetting agents were added to the upper part of the heart drug using a hippet, and the permeation length at room temperature was measured after 24 hours, and this was taken as the total permeation length. In addition, the total penetration length is 24
The average permeation rate was calculated by dividing by time, and this was defined as the permeation rate (mm / Hr). These results are summarized in Table 1. In order to clearly understand the permeation situation, each wetting agent was colored with a coloring agent.

The wettability was evaluated by a sensory test based on the permeation condition and the permeation rate and permeation length shown in Table 1. The degree was evaluated as ◯ for practical problems, Δ for slightly insufficient and × for problems.

Test 2 This is a result of selecting a typical wetting agent and evaluating the relationship between the amount of the wetting agent added to the heart drug and the detonation performance by one No. 6 detonator. In this test, a practical coating material was filled with the moistened core drug according to the present invention, one detonator No. 6 was attached to the outside of the coating material and fixed with tape, and the detonation performance at room temperature was evaluated. The results are shown in Table 2.

Test 3 A representative one of the wetting agents of the present invention was selected, and the results of sensory inspection and evaluation of the type and amount of addition and the spilling state of the heart drug at the time of cutting the explosive ray were summarized in Table 3. In this test, the core material of the present invention was filled in a practical coating material, and the results at the time of cutting were evaluated using a cutter.

As described above, the explosive wire according to the present invention is evenly moistened with the moistening agent, and when practically used, the core medicine does not spill from the cut edge when cut with a cutter or the like. In order to have a wetting effect, it is liquid at around room temperature (about 40 ° C or less), has a viscosity at 25 ° C of 2000 cps or less, and lipophilic ones are effective alone, but hydrophilic ones are surfactants. The effect is obtained by the combined use of. Among the surfactants, the effective amount is 0.05% or more with respect to the hydrophilic substance, and the addition amount of these lipophilic substances and hydrophilic substances with respect to the heart drug is effective in the test 3 As can be seen from the above, there is a limit around 1%, and preferably 3% or more shows a sufficient anti-spill effect.

The main object of the present invention is to provide an explosive wire which is free from spillage of the heart drug at the time of cutting without damaging the heart drug with a wetting agent and lowering the original explosive performance in practical use. Furthermore,
As a secondary effect, according to the BAM friction sensitivity test method, the sensitivity grade of the heart drug according to the present invention was 5% when the amount of the wetting agent added was 10%.
Grade (the grade of the conventional core drug is 4), and the impact sensitivity by the JIS test method is 6th grade (the sensitivity of the conventional core drug is 10% of the core drug related to the present invention with a wetting agent added). (3rd grade)
It can be expected that it will decrease to a higher level and the handling safety at the site of use will be higher, which is preferable. In addition, with such a decrease in sensitivity, there is no problem in practical performance.

[Effects of the Invention] As described above, the explosive wire of the present invention eliminates the spill of the heart drug at the time of cutting, does not deteriorate the original explosive performance, and improves the handling safety. It has a remarkable practical effect.

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Claims (1)

[Claims] 1. A core drug having a diameter of 10 to 15 mm and a coating layer, the core drug being an aqueous solution of a surfactant, a polyhydric alcohol solution of a surfactant, a hydrocarbon mineral oil, and a plasticizer which is liquid at room temperature. ,
An explosive wire comprising one or more of dinitrotoluene and polyethylene glycol, and moistened with a wetting agent of 1 to 15% with respect to a heart drug.